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(?) major, (underlined) March 2,1960, II 7

arently exactly the same as the ones it uttered yesterday evening. One single note might be represented as [squiggly line here]. One doublet might be represented as [2 squiggly lines here].
  Hrr just gave ordinary low and hoarse DN's when being handled. But was quite silent when isolated!
  This afternoon we tried to record both animals - to find their behavior quite different again. Around 1:00 p.m.
  M was quite silent when isolated, but then uttered lots of peculiar notes when handled. Like the DN's she uttered yesterday, but higher pitched and more whistle-like (in this respect, more like the DN's uttered by birds shortly after hatching) but also much more varied in pitch. Rather "bubbling" in effect 
 [3 lines or 4 lines here). I shall call these "DN2", to distinguish them from all the types of DN uttered before (which I shall call DN1).
  It is obvious, I think, that the DN2's are merely a modification of DN1's - but the relationship between DN's and LN's is still dubious. At the present time,m it looks as if the LN pattern may first appear as a "complete," separate, pattern, quite distinct from the DN pattern. Quite different from the development of the calls of gull chicks.
  (Incidentally, I am fairly sure, now, that the "quavering" DN uttered by Hrr described above on Mar. 1, p.6, was merely transitional to DN2, not LN, if it was anything other than (?) aberrant DN1.)
  When we tried to record Hrr this afternoon, it merely uttered a few DN1's, both when being handled and when isolated.
  We did some more testing shortly after 10:00 p.m. tonight - without gettinkg any very interesting results.
  M just uttered a few DN2's when isolated, and remained quite silent